access linkbutton outside datagrid

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DataGrid

Flex

Hi..
i am using below code

<mx:datagridcolumn headertext="Case ID" width="80" xmlns:mx="#unknown">
                    <mx:itemrenderer>
                        <fx:component xmlns:fx="#unknown">
                            <mx:canvas>
                                <mx:linkbutton id="lnkCaseId" click="lnkCaseId.dispatchEvent(new MouseEvent(MouseEvent.CLICK,true,false)))" label="{data.caseId}" textdecoration="underline" color="#0052A5">
                                </mx:linkbutton>
                            </mx:canvas>
                        </fx:component>
                    </mx:itemrenderer>
                </mx:datagridcolumn>

now i want to add eventListener for linkCaseId,how can i access linkCaseId outside the datagrid?
thanks.